¹H-NMR Studies of SDW Properties in (TMTSF)₂PF₆

Abstract

The SDW instability is an important phenomenon characteristic of the low dimensional electron system, together with another type of instability; charge density waves (CDW). The conducting organic compounds (TMTSF)₂X and (TMTTF)₂X have been found to have an antiferromagnetic SDW ground state at ambient pressure. It is believed that this is a common feature of this family with centrosymmetric anions X.^1,2 However, we had little information about the characteristics of SDW’s in these materials: even the fundamental parameters such as the SDW amplitude and the wave number had not yet been determined, mainly because of the lack of available probes to detect SDW’s. Recently, we have succeeded in determining these parameters in a typical material (TMTSF)₂PF₆ by a precise analysis of ¹H-NMR lineshape. In this lecture, we describe how a conventional NMR technique can determine the SDW properties and discuss some of the main results. For the details, you can refer the publications.^1,2